:root {
  color-scheme: light dark;

  --primary: #063c3c;
  --primary-dark: #052222;
  --primary-contrast: #ffffff;
  --accent: #fbba00;
  --accent-contrast: #212121;

  --bg: #fafafa;
  --card-bg: #ffffff;
  --text: #212121;
  --muted: #545454;
  --border: #d1d1d1;
  --danger: #cf2037;
  --taken-bg: #f1efef;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary: #0a5a5a;
    --primary-dark: #063c3c;
    --bg: #121615;
    --card-bg: #1b201f;
    --text: #f1efef;
    --muted: #a8b0af;
    --border: #2c3332;
    --taken-bg: #222726;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Public Sans", ui-sans-serif, system-ui, sans-serif;
}

.topbar {
  background: var(--primary-dark);
  color: var(--primary-contrast);
}

.topbar-inner {
  max-width: 860px;
  margin: 0 auto;
  padding: 1.1rem 1.25rem;
}

.brand-mark {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.page {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--primary-contrast);
  border-radius: 0 0 32px 32px;
  padding: 2.5rem 1.75rem 3rem;
  margin: 0 -1.25rem 2rem;
}

.hero h1 {
  font-size: 1.9rem;
  font-weight: 800;
  margin: 0 0 0.5rem;
}

.hero p {
  margin: 0;
  max-width: 46ch;
  opacity: 0.9;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  box-shadow: 0 1px 3px rgba(6, 60, 60, 0.06);
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 0.4rem;
}

input[type="text"] {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border-radius: 999px;
  border: 1.5px solid var(--border);
  background: transparent;
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  margin-bottom: 0.85rem;
}

input[type="text"]:focus {
  outline: none;
  border-color: var(--primary);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.5rem;
  border-radius: 999px;
  border: none;
  font: inherit;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

.btn:hover {
  opacity: 0.9;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-contrast);
}

.btn-ghost {
  background: transparent;
  border: 1.5px solid var(--border);
  color: var(--text);
}

.event-card h2 {
  margin: 0 0 0.15rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
}

.event-subtitle {
  color: var(--muted);
  margin: 0 0 1rem;
  font-size: 0.9rem;
}

.slot-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
  gap: 0.6rem;
}

.slot-wrapper {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.3rem;
}

.slot-btn {
  width: 100%;
  padding: 0.55rem 0.5rem;
  border-radius: 999px;
  background: transparent;
  border: 1.5px solid var(--primary);
  color: var(--primary);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}

.slot-btn:hover:not(:disabled) {
  background: var(--primary);
  color: var(--primary-contrast);
}

.slot-btn.taken {
  background: var(--taken-bg);
  border-color: var(--taken-bg);
  color: var(--muted);
  cursor: not-allowed;
}

.slot-unavailable {
  margin: 0;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--danger);
  text-align: center;
  line-height: 1.2;
}

.muted {
  color: var(--muted);
}

.error {
  color: var(--danger);
  font-size: 0.9rem;
  font-weight: 600;
}

.hidden {
  display: none !important;
}

.modal {
  position: fixed;
  inset: 0;
  background: rgba(5, 34, 34, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 10;
}

.modal-content {
  width: 100%;
  max-width: 420px;
}

.modal-content h2 {
  margin-top: 0;
  color: var(--primary);
  font-size: 1.2rem;
}

.modal-slot-info {
  font-weight: 600;
  margin-bottom: 1rem;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.6rem;
  margin-top: 0.5rem;
}

.matricola-row {
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
}

.matricola-row input[type="text"] {
  flex: 1;
}

.matricola-row .btn {
  flex-shrink: 0;
  padding: 0.65rem 1.1rem;
}

.modal-summary {
  background: var(--taken-bg);
  border-radius: 14px;
  padding: 0.85rem 1rem;
  margin-bottom: 0.85rem;
}

.modal-summary p {
  margin: 0 0 0.25rem;
}

.modal-summary p:last-child {
  margin-bottom: 0;
}

.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid rgba(33, 33, 33, 0.3);
  border-top-color: var(--accent-contrast);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}